KeenGamer: “Using data from the past, let’s see how large the world of Starfield may be upon its release. In a recent appearance, Bethesda’s creative director Todd Howard revealed that Starfield will feature over 150,000 lines of dialogue and over 300 actors. Using these figures, we can estimate how many quests and characters Starfield will have.”
Source: N4G PC How Many Quests and Characters Will Starfield Have?